Ancalagon may refer to:
- Ancalagon the Black, a dragon from the works of J.R.R. Tolkien
- Ancalagon (genus), a Cambrian priapulid worm
- Ankalagon saurognathus, a Paleocene mesonychid mammal, originally named Ancalagon and later renamed
| This disambiguation page lists articles associated with the title Ancalagon.
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